Stress intensity factor and crack propagation behavior of thin α-alumina

Hajime Matsuo, Yusuke Kaieda, Nobuhiro Kojima, Ken Ichi Ikeda, Satoshi Hata, Hideharu Nakashima

Research output: Contribution to journalArticle

Abstract

This paper reports the mechanical property and crack propagation behavior of thin ceramics. A method to evaluate the stress intensity factor, K I, of thin ceramics was proposed. Dependence of KI values on the average grain size, d, of thin α-alumina were measured by the method. KI values of thin α-alumina decreased with increasing d values from 4.3 μm to 15.2 μm, while the KI values were almost constant for 15.2 μm ≤d≤63.0 μm. The trend of KI values agreed with the dependence of fracture toughness, Kc, of bulk α-alumina. The thin α-alumina specimens after crack propagation were investigated by scanning electron microscopic electron back-scattered diffraction (SEM/EBSD) analysis. Branched cracks were hardly observed, regardless of grain size. The result indicates that the toughing mechanism do not occur in the thin α-alumina. Dependence of the transgranular fracture rate, F, and the crack deflection rate, D, on d were measured from the orientation distribution maps. However, the F values and the D values were independent of d and approximately constant. The F values and D values depend on d in bulk α-alumina. It indicates that the crack propagation behavior is varied by thinning α-alumina.

Original languageEnglish
Pages (from-to)24-29
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume74
Issue number1
DOIs
Publication statusPublished - Jan 1 2010

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stress intensity factors
Aluminum Oxide
crack propagation
Stress intensity factors
Crack propagation
Alumina
aluminum oxides
propagation
cracks
grain size
ceramics
Cracks
Electrons
fracture strength
Fracture toughness
deflection
electrons
Diffraction
mechanical properties
Scanning

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Stress intensity factor and crack propagation behavior of thin α-alumina. / Matsuo, Hajime; Kaieda, Yusuke; Kojima, Nobuhiro; Ikeda, Ken Ichi; Hata, Satoshi; Nakashima, Hideharu.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 74, No. 1, 01.01.2010, p. 24-29.

Research output: Contribution to journalArticle

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